"Nicolas the problem with saving the raster using QGIS processes is the
resampling when converting sgrd to tif"
That was my conclusion also but//I was trying to figure out if this was
a bug or not. If you use the temporary file created as is, it works well.
Thanks!
Nicolas
On 2021-08-20 11:23 a.m., Luis Eduardo wrote:
Very true John, that's another detail, some algorithms need a
cartographic projection to work, for example upslope area.
Nicolas the problem with saving the raster using QGIS processes is the
resampling when converting sgrd to tif, if you perform the same
process as temporary it does not fail.
On Friday, August 20, 2021, 11:02:40 AM GMT-4, Nicolas Cadieux
<[email protected]> wrote:
Hi,
When you save the file, are you changing the crs? If the ordinal DEM
is in meters and the exported file in long last, the algorithm could
go funny on you as some algorithms need files that are in meters to
work well.
Btw, would you be using saga in processing to do this? Is so. I have
had a problem in the past where I could use a tiff, fill the sinks and
then extract streams all in one shot. But if I saved the fill sink
file and tried to use it later, I would get unusual results in th
stream. If you have this problem, we should file a bug report.
Nicolas Cadieux
https://gitlab.com/njacadieux <https://gitlab.com/njacadieux>
Le 20 août 2021 à 06:44, [email protected] a écrit :
Hi All, I am relatively new to GIS and was hoping for some help with a
problem I have.
When I load a DEM (tiff) file from an external source and fill sinks I
can extract the Strahler order without issue. However after I save the
file using the QGIS export feature and attempt to extract the Strahler
order there is an issue where I appear to just get many short streams
that don’t connect. Looking at the layer attributes between the
unsaved file and the saved one they appear identical.
I would appreciate some suggestions as it is frustrating not being
able to save the updated DEM so it works.
Regards
John
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https://gitlab.com/njacadieux
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